MADEIRA, MACARONESIA—Dates for a sample of fossilized bone from a house mouse suggest that the rodents were carried to the island of Madeira by European colonists before A.D. 1036, or 400 earlier than previously thought. (The Portuguese took possession of Madeira in 1419.) “Current populations of house mice on Madeira show similarities in mitochondrial DNA with those in Scandinavia and northern Germany, but not with those in Portugal,” Josep Antoni Alcover of the Mediterranean Institute for Advanced Studies told Phys.org. Could the mice have traveled to the island with the Vikings? Further morphologic and genetic studies of the fossils are needed. “There are no historical references so far about the Vikings traveling to Macaronesia,” Alcover added.